Journal of the Society of Motion Picture Engineers (1930-1949)

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COAX FEED TO KIN* RECORDING BUS Fig. 2. Transmitter bus — video distribution. It may be stated here that all the reels in the vans are power-driven on take-up by an ordinary portable electric drill with a J-in. chuck. Needless to say that since the system carries 18,000 ft of assorted cable this is quite a time and labor saver. Originally the film chain was placed in the receiver bus due to a lack of space in the transmitter bus. This handicapped the program director in that he could not preview film. When a kinerecording unit was added it was decided to remove the film chain from the receiver bus and place it in the kinerecording van since this van was to be located next to the transmitter bus and the two attached directly by cable. Film video signal now feeds through coaxial cable to an isolation amplifier in the transmitter bus and from there to an auxiliary input of the switcher where it can be previewed on the master monitor by throwing a monitor selector switch. As can be seen in the block diagram of Fig. 2, the line output of the switcher feeds both the microwave unit (a standard RCA Type TTR-1B on 7125 me) and the kine-recording bus through a paralleled distribution amplifier. The auxiliary output is also paralleled to feed the TM-2A auxiliary monitor in the cab, an announce position, and also a feed for stage monitor. Two RCA Type OP7 portable mixers feeding a single OP6 amplifier provide eight low-level audio inputs. For ac 464 December 1952 Journal of the SMPTE Vol. 59